Add Vector2d classes that represent offsets, instead of using Point.

ui/views/view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/events/event.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/compositor/layer_owner.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/vector2d.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/focus_border.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_comptr.h"
 #endif
 
 using ui::OSExchangeData;
 
@@ skipping 816 matching lines @@
   // Invoked during a drag and drop session when OnDragUpdated returns a valid
   // operation and the user release the mouse.
   virtual int OnPerformDrop(const ui::DropTargetEvent& event);
 
   // Invoked from DoDrag after the drag completes. This implementation does
   // nothing, and is intended for subclasses to do cleanup.
   virtual void OnDragDone();
 
   // Returns true if the mouse was dragged enough to start a drag operation.
   // delta_x and y are the distance the mouse was dragged.
-  static bool ExceededDragThreshold(int delta_x, int delta_y);
+  static bool ExceededDragThreshold(const gfx::Vector2d& delta);
 
   // Accessibility -------------------------------------------------------------
 
   // Modifies |state| to reflect the current accessible state of this view.
   virtual void GetAccessibleState(ui::AccessibleViewState* state) { }
 
   // Returns an instance of the native accessibility interface for this view.
   virtual gfx::NativeViewAccessible GetNativeViewAccessible();
 
   // Scrolling -----------------------------------------------------------------
@@ skipping 609 matching lines @@
   base::win::ScopedComPtr<NativeViewAccessibilityWin>
       native_view_accessibility_win_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_